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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Don A. Bailey‏ @DonAndrewBailey May 3

      Me: OpenSSH is one of the most secure apps ever written, even in C C Haters: no it’s not! Several RCE bugs! Me: prove it. Show me a working exploit. *crickets* FUD and Security pedanticism is unbecoming of our insustry, Pals.

      24 replies 109 retweets 386 likes
    2. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      https://dl.packetstormsecurity.net/1106-exploits/ssh_preauth_freebsd.txt …

      4 replies 0 retweets 7 likes
    3. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      That’s a good one and valid, but not one of the bugs anyone else has brought up 😂. Besides, having bugs isn’t the issue. Resolving, reducing, and remaining well architected is the point.

      1 reply 0 retweets 4 likes
    4. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      Yep. And choosing a language that eliminates whole classes of exploitable vulnerabilities is part of good architecture in my book. I won't deny that OpenSSH is comparatively well written. But writing C is much harder than most people realize. Undefined behaviour everywhere.

      1 reply 1 retweet 20 likes
    5. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      Yeah no one is disagreeing. Ignoring better options isn’t the point. Acknowledging that good architecture is a choice is. It isn’t really “harder” now, either. In fact it’s easier today to write safe C than ever before. We know more & have better tools/OS guards. It’s easy now :)

      1 reply 0 retweets 3 likes
    6. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      Easy really is the wrong word here. And there's still stuff sanitizers and static analyzers don't see. There's still exploits despite mitigations. In most cases, there's just no need to waste cognitive load on low level details. Higher level languages are more economical.

      1 reply 0 retweets 9 likes
    7. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      I’m one of the best when it comes to finding 0day in C. :) but I know it’s easy now, to write safe C. You can disagree all you want, but the tools and mitigation’s are available. Our industry failure is not making access simple and straight forward.

      2 replies 0 retweets 2 likes
    8. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      #define SIZE 8192 char buf[SIZE]; void cpy(struct foo* p, int count) { int n = count * sizeof(struct foo); if ((n < SIZE) && (n > 0)) memcpy(buf, p, n); } Safe or not? Why? How many people can spot this? Which tools? Far from easy.

      6 replies 1 retweet 10 likes
    9. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      Creating situations that are easily avoidable doesn’t prove your point, it proves mine. :)

      1 reply 0 retweets 3 likes
    10. andreasdotorg‏ @andreasdotorg May 4
      Replying to @DonAndrewBailey

      What about the situation in the above code is easy to avoid? I've shown the snippet to rooms full of people who do code audits for a living. Maybe 1 in 30 even gets what the problem is. Regular engineers? Zero out of 30.

      5 replies 0 retweets 2 likes
      Rich Felker‏ @RichFelker May 4
      Replying to @andreasdotorg @DonAndrewBailey

      Use of int for a size, multiplication to compute a size with no prior overflow check.

      5:35 AM - 4 May 2018
      0 replies 0 retweets 0 likes

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